Improvement in counterfeit-coin detecters



E. STREET. Counterfeit Coin Detector.

No. 209,145. Patented Oct. 22,1878.

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PETERS. PHOTO- LITHOGRAPHER, WASHINGTON. D. c.

UNITED STATES PATENT QFFIOE.

EDWIN STREET, OF SOUTH ORANGE, NEW JERSEY.

IMPROVEMENT IN COUNTERFElT-COIN DETECTERS.

Specification forming part of Letters Patent No. 209,145, dated October22, 1878; application filed March 1, 1878.

To all whom it may concern:

Be it known that I, EDWIN STREET, of South Orange, in the county ofEssex and State of New Jersey, have invented a new and usefulImprovement in Letter-Scale and Coin-Detector, which improvement isfully set forth in the following specification and accompanyingdrawings, in which- Figure 1 is a side elevation of the scale anddetecter embodying lny invention. Fig. 2 is a top view thereof. Fig. 3is a longitudinal vertical section thereof.

Similar letters of reference indicate corresponding parts in the severalfigures.

My invention consists of an implement adapted for the combined purposesof weighing letters and indicating the character of com.

I employ a plate with a slide, an index, and an elevated tray withconcentric concavities and slots, the operation whereof will be morefully set forth.

Referring to the drawings, A represents a poise or balance-plate, and Bthe standards thereof. On one side of the plate A there is supported atray, 0, on whose upper face is a series of concentric concavities, a,which increase in depth and are of diameters correspondin g to those ofvarious denominations of coin to be weighed, so that genuine coin willexactly fit the relative concavity.

In the tray there are also formed slots 2), of dimensions correspondingto the thickness of genuine coin, whereby the latter will exactly fitthe relative slot. To the plate A, on the side opposite to the tray 0,there is fitted a slide, D, which carries a double index, E, overhangingthe respective portion of the plate A, and pointing to postal and coingradations (Z (Z formed on the said portion of the plate, the indexbeing preferably constructed of spring metal, so as to produce frictionbetween the plate and slide and prevent accidental movement of thelatter during the operations of weighing letters or detecting coin.

In order to weigh a letter, the latter is placed on the tray 0, andtheslide D is moved until the plate is balanced, the tray beingelevatedto prevent contact of the letters, &c., with adjacent parts of thedevice. The weight of the letter may now be readily read off byobserving the location of the index on the graduation or postal scale(1.

Vhen coin is to be weighed the scale will be moved to bring the indexover the graduations (1, opposite the one corresponding to the weight ofthe genuine coin. 1f the scale is in equilibrium, the coin may beconsidered genuine, subject to the further test of the manner in whichthe coin fits the relative concavity a and slot 1').

It will be noticed that the slide D constitutes the counterpoise ofthescale, thus dispensing with separate weights, and that the coins ofdifferent denominations are weighted on the same tray 0, thus producinga simple and compact implement for the purposes intended.

For delicate weighing of coin and letters, I employ an auxiliary indexor finger, F, which is secured to the axis of the plate A and sweepsover the adjacent standard B, having a central mark or characteristicfor indicating the true weight of the genuine coin or registering withthe graduations d d of the plate A.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

- The plate A and slide D, in combination with the elevated tray 0,provided with concentric concavities a and surrounding slots I),substantially as and for the purpose set forth.

EDWIN STREET.

Witnesses:

ROBERT H. PoLLocK, ELI Lone.

